P2812 on 2020-2021 Cadillac CT5 — Pressure Control Solenoid "G" Control Circuit/Open
1 vehicles · 1 makes
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Cadillac CT5 · 2020–2021
Owners of 2020-2021 Cadillac CT5 and CT5-V models equipped with the GM Hydra-Matic 10L80 10-speed automatic report harsh, abrupt shifts accompanied by an illuminated check engine light. GM Preliminary Information bulletin PIP5799 documents an electrical fault in Transmission Control Solenoid Valve 7 (the line pressure solenoid) that stores DTC P2812 or P2814 in the TCM. Separately, NHTSA Safety Recall N242480630 (NHTSA 25V148) covers TCM monitoring software for a related transmission control valve wear condition that, in rare cases, can cause momentary wheel lock-up. A related Special Coverage bulletin (N242480631) extends warranty for the P0747 control-valve condition to 15 years / 150,000 miles. Note: the 2020-2021 CT5 does not include the CT5-V Blackwing (introduced for MY2022 with the 10L90), which is NOT part of this recall population.
Common Symptoms
- Harsh or abrupt shifts
- Check engine / SES light
- Reduced engine performance / Reduced Propulsion message
- Possible momentary wheel lock-up (subject of recall N242480630)
How to Fix
Scan the TCM; if P2812 or P2814 is set, follow SI diagnostics for the line pressure solenoid circuit. PIP5799 directs that, if no other root cause is found, the valve body is replaced. Also verify GM Safety Recall N242480630 (TCM monitoring software for wheel lock-up risk) has been performed; owner letters were mailed April 7, 2025. If P0747 sets after the TCM update, the control valve body replacement is covered under Special Coverage N242480631 for 15 years / 150,000 miles.
Sources for this issue (1)
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P2812 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2812 mean?
P2812 stands for "Pressure Control Solenoid "G" Control Circuit/Open." This code means the transmission control module detected an open (broken) electrical circuit for pressure control solenoid "G". Pressure control solenoids regulate the hydraulic fluid pressure that applies the transmission's clutches and bands to produce each gear. An open circuit means the module can't properly command that solenoid, which commonly causes harsh shifting, slipping, or limp mode. It is usually an electrical or solenoid fault rather than mechanical wear.
What are the most common causes of P2812?
The most common causes of P2812 are: Faulty pressure control solenoid "G", Open or broken wiring in the solenoid circuit, Corroded or disconnected connector, Damaged internal transmission wiring harness, Low or dirty transmission fluid affecting the solenoid, Faulty transmission control module. The specific cause varies by vehicle.
How much does it cost to fix P2812?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P2812?
Au7o has documented P2812 across 1 vehicle models from 1 manufacturers: Cadillac.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.